Fluorescence Emission in the Gas Phase of Several Aromatic Hydrocarbons

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Abstract
The fluorescence and excitation spectra of several condensed aromatic hydrocarbons were measured in the gas phase at low pressures. The emission from the second excited singlet state (S2 emission) could be observed with some of the compounds studied, in which the first weak absorption band is located close to the second much stronger band. The relative yield of the S2 emission always increased with the increase in the excitation wave number. It has been shown that the occurrence of the S2 emission can be explained in a qualitative way by the state densities and the radiative rates. In coronene, an emission to be regarded as originating from the third excited singlet state was observed.

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